5.
Euthamia occidentalis
Nuttall, Trans. Amer. Philos. Soc., n. s. 7: 326. 1840.
Western goldentop
Euthamia californica Gandoger; E. linearifolia Gandoger; Solidago occidentalis (Nuttall) Torrey & A. Gray
Perennials or subshrubs,
40—200 cm.
Stems
(erect, stout) glabrous, glaucous.
Leaves
spreading-ascending to erect; blades 3- or -5-nerved, linear, 82—100 × 4.3—10 mm, lengths 10—27 times widths, gradually to abruptly reduced distally, herbaceous to firm-herbaceous, margins scabrous, apices abruptly acute to acuminate, faces ± gland-dotted (18—56 dots per mm²), adaxial and vein axils often sparsely hairy.
Heads
mostly pedunculate, in relatively narrow, elongate arrays 33—60% of plant heights (often interrupted and with multiple levels).
Involucres
campanulate, 3.7—4.9 mm.
Phyllaries
stramineous, sometimes green-tipped, outer narrowly lanceolate, inner linear (firm), apices acute to acuminate.
Ray florets
(15—)17—22(—28).
Disc florets
(7—)9—11(—18); corollas 3.1—4.2 mm.
2
n
= 18.
Flowering Jul—Nov. Moist to wet soils of streambeds, lake shores, and fresh to saline marshes; 0—1600 m; B.C.; Ariz., Calif., Colo., Idaho, Mont., Nebr., Nev., N.Mex., Oreg., Utah, Wash., Wyo.; Mexico (Baja California).
